101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/* PR c/64610 */
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/* { dg-do compile } */
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/* { dg-options "-Wbool-compare" } */
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#ifndef __cplusplus
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# define bool _Bool
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# define true 1
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# define false 0
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#endif
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extern bool foo (void);
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enum { A, B };
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int
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fn1 (bool b)
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{
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int r = 0;
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r += b >= 0; /* { dg-warning "with boolean expression is always true" } */
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r += b > 0;
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r += b < 0; /* { dg-warning "with boolean expression is always false" } */
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r += b <= 0;
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r += b >= 1;
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r += b > 1; /* { dg-warning "with boolean expression is always false" } */
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r += b < 1;
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r += b <= 1; /* { dg-warning "with boolean expression is always true" } */
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r += foo () >= 0; /* { dg-warning "with boolean expression is always true" } */
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r += foo () > 0;
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r += foo () < 0; /* { dg-warning "with boolean expression is always false" } */
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r += foo () <= 0;
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r += foo () >= 1;
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r += foo () > 1; /* { dg-warning "with boolean expression is always false" } */
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r += foo () < 1;
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r += foo () <= 1; /* { dg-warning "with boolean expression is always true" } */
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r += b >= A; /* { dg-warning "with boolean expression is always true" } */
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r += b > A;
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r += b < A; /* { dg-warning "with boolean expression is always false" } */
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r += b <= A;
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r += b >= B;
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r += b > B; /* { dg-warning "with boolean expression is always false" } */
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r += b < B;
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r += b <= B; /* { dg-warning "with boolean expression is always true" } */
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/* Swap LHS and RHS. */
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r += 0 >= b;
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r += 0 > b; /* { dg-warning "with boolean expression is always false" } */
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r += 0 < b;
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r += 0 <= b; /* { dg-warning "with boolean expression is always true" } */
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r += 1 >= b; /* { dg-warning "with boolean expression is always true" } */
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r += 1 > b;
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r += 1 < b; /* { dg-warning "with boolean expression is always false" } */
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r += 1 <= b;
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r += 0 >= foo ();
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r += 0 > foo (); /* { dg-warning "with boolean expression is always false" } */
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r += 0 < foo ();
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r += 0 <= foo (); /* { dg-warning "with boolean expression is always true" } */
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r += 1 >= foo (); /* { dg-warning "with boolean expression is always true" } */
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r += 1 > foo ();
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r += 1 < foo (); /* { dg-warning "with boolean expression is always false" } */
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r += 1 <= foo ();
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r += A >= b;
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r += A > b; /* { dg-warning "with boolean expression is always false" } */
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r += A < b;
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r += A <= b; /* { dg-warning "with boolean expression is always true" } */
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r += B >= b; /* { dg-warning "with boolean expression is always true" } */
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r += B > b;
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r += B < b; /* { dg-warning "with boolean expression is always false" } */
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r += B <= b;
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return r;
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}
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int
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fn2 (int i, int j)
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{
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int r = 0;
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r += (i == j) >= 0; /* { dg-warning "with boolean expression is always true" } */
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r += (i == j) > 0;
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r += (i == j) < 0; /* { dg-warning "with boolean expression is always false" } */
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r += (i == j) <= 0;
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r += (i == j) >= 1;
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r += (i == j) > 1; /* { dg-warning "with boolean expression is always false" } */
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r += (i == j) < 1;
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r += (i == j) <= 1; /* { dg-warning "with boolean expression is always true" } */
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return r;
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}
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